I had one 1gb disk with c drive installed Window7 and D drive for files. E drive is not formatted initially.
then I tried ubuntu by installing in E drive and assign D as swap drive.
not realizing ubuntu not able to play some video formats so after boot into Window7 I just deleted the E drive(Ubuntu). Can't reboot back to Window&, after some research I use MBRFIX on drive C, I now able to boot into Window7, but drive D is not visible. On disk management. this volume shows as (layout)Simple, (type) Basic, (under file system)empty, status shows healthy (primary partition).